Background: Hi, I'm new to modding in civ 5. I'm trying to add custom promotions, which I'm having some difficulty with. My background in coding is that I've completed AP computer science, which covers java up to inheritance. My ideas are: Add a promotion to Great War Infantry that gives them a bonus in forts. Create a promotion that gives a negative modifier that increases with war duration. Add the janissary promotion to other units. How can I do this?